The ratio between the volume of a sphere and volume of a circumscribing right circular cylinder is 2:1         (b)  1:1      (c)  2:3           (d)  1

Explanation

Let r be the radius of the sphere, then
Volume`=4/3pir^3`
Diameter of circumscribed cylinder` = 2r`
radius `=r`, height`=h=2r`
volume is `=pir^2h=pir^2xx2r=2pir^3`
Ratio between the volume of two`=4/3pir^3:2pir^3`
`4/3:2=4:6=2:3`